From nobody Fri Dec 19 20:14:24 2025 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 15461EB64DD for ; Fri, 16 Jun 2023 06:25:28 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S244885AbjFPGZN (ORCPT ); Fri, 16 Jun 2023 02:25:13 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:55860 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S243515AbjFPGWp (ORCPT ); Fri, 16 Jun 2023 02:22:45 -0400 Received: from metis.ext.pengutronix.de (metis.ext.pengutronix.de [IPv6:2001:67c:670:201:290:27ff:fe1d:cc33]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id BE5D230F9 for ; Thu, 15 Jun 2023 23:22:25 -0700 (PDT) Received: from drehscheibe.grey.stw.pengutronix.de ([2a0a:edc0:0:c01:1d::a2]) by metis.ext.pengutronix.de with esmtps (TLS1.3:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1qA2q9-0006qR-DU; Fri, 16 Jun 2023 08:21:45 +0200 Received: from [2a0a:edc0:0:1101:1d::28] (helo=dude02.red.stw.pengutronix.de) by drehscheibe.grey.stw.pengutronix.de with esmtp (Exim 4.94.2) (envelope-from ) id 1qA2q8-007kyL-KZ; Fri, 16 Jun 2023 08:21:44 +0200 Received: from sha by dude02.red.stw.pengutronix.de with local (Exim 4.94.2) (envelope-from ) id 1qA2q5-003FUz-2x; Fri, 16 Jun 2023 08:21:41 +0200 From: Sascha Hauer To: linux-rockchip@lists.infradead.org Cc: linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-pm@vger.kernel.org, Heiko Stuebner , Kyungmin Park , MyungJoo Ham , Will Deacon , Mark Rutland , kernel@pengutronix.de, Michael Riesch , Robin Murphy , Vincent Legoll , Rob Herring , Krzysztof Kozlowski , Conor Dooley , devicetree@vger.kernel.org, Sebastian Reichel , Sascha Hauer , Jonathan Cameron Subject: [PATCH v6 14/26] PM / devfreq: rockchip-dfi: Prepare for multiple users Date: Fri, 16 Jun 2023 08:20:49 +0200 Message-Id: <20230616062101.601837-15-s.hauer@pengutronix.de> X-Mailer: git-send-email 2.39.2 In-Reply-To: <20230616062101.601837-1-s.hauer@pengutronix.de> References: <20230616062101.601837-1-s.hauer@pengutronix.de> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-SA-Exim-Connect-IP: 2a0a:edc0:0:c01:1d::a2 X-SA-Exim-Mail-From: sha@pengutronix.de X-SA-Exim-Scanned: No (on metis.ext.pengutronix.de); SAEximRunCond expanded to false X-PTX-Original-Recipient: linux-kernel@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" When adding perf support later the DFI must be enabled when either of devfreq-event or perf is active. Prepare for that by adding a usage counter for the DFI. Also move enabling and disabling of the clock away from the devfreq-event specific functions to which the perf specific part won't have access. Reviewed-by: Jonathan Cameron Reviewed-by: Sebastian Reichel Link: https://lore.kernel.org/r/20230524083153.2046084-15-s.hauer@pengutron= ix.de Signed-off-by: Sascha Hauer --- drivers/devfreq/event/rockchip-dfi.c | 57 +++++++++++++++++++--------- 1 file changed, 40 insertions(+), 17 deletions(-) diff --git a/drivers/devfreq/event/rockchip-dfi.c b/drivers/devfreq/event/r= ockchip-dfi.c index d39db5de7f19c..8a7af7c32ae0d 100644 --- a/drivers/devfreq/event/rockchip-dfi.c +++ b/drivers/devfreq/event/rockchip-dfi.c @@ -68,13 +68,28 @@ struct rockchip_dfi { void __iomem *regs; struct regmap *regmap_pmu; struct clk *clk; + int usecount; + struct mutex mutex; u32 ddr_type; unsigned int channel_mask; }; =20 -static void rockchip_dfi_start_hardware_counter(struct rockchip_dfi *dfi) +static int rockchip_dfi_enable(struct rockchip_dfi *dfi) { void __iomem *dfi_regs =3D dfi->regs; + int ret =3D 0; + + mutex_lock(&dfi->mutex); + + dfi->usecount++; + if (dfi->usecount > 1) + goto out; + + ret =3D clk_prepare_enable(dfi->clk); + if (ret) { + dev_err(&dfi->edev->dev, "failed to enable dfi clk: %d\n", ret); + goto out; + } =20 /* clear DDRMON_CTRL setting */ writel_relaxed(HIWORD_UPDATE(0, DDRMON_CTRL_TIMER_CNT_EN | DDRMON_CTRL_SO= FTWARE_EN | @@ -99,14 +114,30 @@ static void rockchip_dfi_start_hardware_counter(struct= rockchip_dfi *dfi) /* enable count, use software mode */ writel_relaxed(HIWORD_UPDATE(DDRMON_CTRL_SOFTWARE_EN, DDRMON_CTRL_SOFTWAR= E_EN), dfi_regs + DDRMON_CTRL); +out: + mutex_unlock(&dfi->mutex); + + return ret; } =20 -static void rockchip_dfi_stop_hardware_counter(struct rockchip_dfi *dfi) +static void rockchip_dfi_disable(struct rockchip_dfi *dfi) { void __iomem *dfi_regs =3D dfi->regs; =20 + mutex_lock(&dfi->mutex); + + dfi->usecount--; + + WARN_ON_ONCE(dfi->usecount < 0); + + if (dfi->usecount > 0) + goto out; + writel_relaxed(HIWORD_UPDATE(0, DDRMON_CTRL_SOFTWARE_EN), dfi_regs + DDRMON_CTRL); + clk_disable_unprepare(dfi->clk); +out: + mutex_unlock(&dfi->mutex); } =20 static void rockchip_dfi_read_counters(struct rockchip_dfi *dfi, struct dm= c_count *count) @@ -124,29 +155,20 @@ static void rockchip_dfi_read_counters(struct rockchi= p_dfi *dfi, struct dmc_coun } } =20 -static int rockchip_dfi_disable(struct devfreq_event_dev *edev) +static int rockchip_dfi_event_disable(struct devfreq_event_dev *edev) { struct rockchip_dfi *dfi =3D devfreq_event_get_drvdata(edev); =20 - rockchip_dfi_stop_hardware_counter(dfi); - clk_disable_unprepare(dfi->clk); + rockchip_dfi_disable(dfi); =20 return 0; } =20 -static int rockchip_dfi_enable(struct devfreq_event_dev *edev) +static int rockchip_dfi_event_enable(struct devfreq_event_dev *edev) { struct rockchip_dfi *dfi =3D devfreq_event_get_drvdata(edev); - int ret; - - ret =3D clk_prepare_enable(dfi->clk); - if (ret) { - dev_err(&edev->dev, "failed to enable dfi clk: %d\n", ret); - return ret; - } =20 - rockchip_dfi_start_hardware_counter(dfi); - return 0; + return rockchip_dfi_enable(dfi); } =20 static int rockchip_dfi_set_event(struct devfreq_event_dev *edev) @@ -190,8 +212,8 @@ static int rockchip_dfi_get_event(struct devfreq_event_= dev *edev, } =20 static const struct devfreq_event_ops rockchip_dfi_ops =3D { - .disable =3D rockchip_dfi_disable, - .enable =3D rockchip_dfi_enable, + .disable =3D rockchip_dfi_event_disable, + .enable =3D rockchip_dfi_event_enable, .get_event =3D rockchip_dfi_get_event, .set_event =3D rockchip_dfi_set_event, }; @@ -272,6 +294,7 @@ static int rockchip_dfi_probe(struct platform_device *p= dev) return PTR_ERR(dfi->regmap_pmu); =20 dfi->dev =3D dev; + mutex_init(&dfi->mutex); =20 desc =3D &dfi->desc; desc->ops =3D &rockchip_dfi_ops; --=20 2.39.2